CAJ | 학술논문

简要介绍了独立分量分析的基本原理及算法,探讨了结构的正规坐标与独立分量的关系.分析认为,结构自由振动响应的振型分解可以看做是一个ICA问题.因此,可以把独立分量分析发展成为一种利用结构自由振动响应时域信号进行模态参数识别的方法.结合数值仿真算例及振动试验,验证了独立分量分析用于结构模态参数识别的有效性.结果表明,独立分量分析可以准确的从结构自振响应中,分离出各正规坐标,同时估计出各阶模态振型向量,适用于环境激励下的工作模态参数识别.
간요개소료독립분량분석적기본원리급산법,탐토료결구적정규좌표여독립분량적관계.분석인위,결구자유진동향응적진형분해가이간주시일개ICA문제.인차,가이파독립분량분석발전성위일충이용결구자유진동향응시역신호진행모태삼수식별적방법.결합수치방진산례급진동시험,험증료독립분량분석용우결구모태삼수식별적유효성.결과표명,독립분량분석가이준학적종결구자진향응중,분리출각정규좌표,동시고계출각계모태진형향량,괄용우배경격려하적공작모태삼수식별.
The basic theory and algorithm of independent component analysis were briefly introduced, and then the relations between normal coordinates and independent components were discussed. Normal coordinates were considered as a specific case of sources with certain time structure. So, the mode-superposition of structure can be identified by blind source separation algorithms and independent component analysis was developed to identify structural modal parameters by using free vibration response signal directly. Numerical simulation and experimental results indicate that independent component analysis is robust to mode shape extraction and suitable for output-only structural modal parameter identification.